禁じられた旋律 処女にナニが起こったか

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In the year 2012, a vampire virus has ravaged the world. Luckily, a company was able to develop and distribute a so-called "Vampire Control System", which allows the unaffacted population to use the vampires as docile slave labor. One day, a young girl with aspirations to one day become a great pianist asks to be hired as a maid at the family home of head of the company responsible for the "Vampire Control System"...